Video: Lady Gaga Performs 'Born This Way' With YouTube Star

It was a performance of a lifetime for YouTube star Maria Aragon on Thursday night. The 10-year-old singer joined Lady Gaga on stage at her concert in Toronto to perform 'Born This Way' live in front of thousands of people.

Aragon rose to YouTube fame after a video of herself singing the anthem went viral. Lady Gaga got wind of the young girl's video and tweeted a link to it, writing, "Can't stop crying watching this. This is why I make music. She is the future."

The singer got in touch with Aragon, who lives in Canada, and invited her to perform the song with her onstage during her Toronto concert.

"I'm really excited Maria is here today because Maria represents what this song is all about. It's all about the next generationof the future," Gaga told the crowd before the song. Watch the video inside.

"I just wanted to say I'm really grateful for all of you. I just want to thank all of you for all your support," Aragon told the roaring crowd after the duet, with Lady Gaga watching with tears in her eyes. "I want to shout out to all my friends back in Winnipeg, and my family, and all you guys -- thank you so much."

Watch Aragon's live performance with Lady Gaga and her original YouTube video below.